<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        div:lang(en){
            color: red
        }
    </style>
</head>
<body>
   <div>文本1</div>
   <span>文本2</span> 
</body>
</html>